Catholics don’t just appeal to Matthew 16:18-19 to make this point.
They also make an argument from Luke 22:31-32. There, Jesus says, “Simon, Simon, behold, Satan demanded to have you, that he might sift you like wheat, but I have prayed for you that your faith may not fail; and when you have turned again, strengthen your brethren.”
Here we find are two clues that, when taken together, reveal Peter’s unique role as leader of the Church. The first is Jesus’ prayer of protection. Jesus informs the apostles that Satan desires to sift all of them, which we know from the use of the Greek second person plural pronoun, humas. When Jesus speaks of his protection prayer in the next verse, however, the Greek text switches to second person singular, sou. Jesus thus singles out Peter when he makes the promise, “I have prayed for you [Greek, sou] that your faith may not fail.” Jesus then commands Peter, and only Peter to strengthen the brethren.
If Jesus intended all the apostles to be equal in their mission of leading his Church, it’s hard to see why Jesus would have promised only Peter a special protection that’s connected to his unique command for Peter to strengthen the brethren. Peter receives a special prayer of protection from Jesus because he’s the preeminent apostle who must strengthen the others.
Some Protestant comebacks to this argument attack the inference from the unique promise to protect Peter in faith; others attack the inferred significance of the unique command to strengthen the brethren. Let’s look at one example
“Jesus prays for others as well.”
This comeback aims to undercut the significance of the prayer for Peter by appealing to Jesus’ general role as intercessor. Some Protestant apologists argue, “Jesus’ prayer for Peter is in keeping with his general intercessory ministry for all believers.” They then goes on to cite Romans 8:34, Hebrews 7:25 and John 17:15, which affirm that Christ intercedes for us. So Jesus was not signaling a special role for Peter but merely doing what he does for all his flock—interceding before the Father.
Answering the Comeback
It’s true that Jesus has a general ministry of intercession for all believers. But this argument ignores the context of Jesus’ prayer for Peter, which intentionally follows his telling the apostles that Satan desired to sift all of them. Jesus is not exercising his general intercessory ministry for all believers in this passage because Luke explicitly tells us the prayer is for Peter alone, even though Satan was going to test them all. That Jesus has a general intercessory role as our high priest in heaven doesn’t take away from the fact that, here, Jesus prays for Peter in a unique way. And that unique prayer reveals Peter’s unique role as chief leader in the Church.”
Love & fidelity,
Matthew
Summa Catechetica, "Neque enim quaero intelligere ut credam, sed credo ut intelligam." – St Anselm, "“Si comprehendus, non est Deus.” -St Augustine, "Let your religion be less of a theory, and more of a love affair." -G.K. Chesterton, “When we pray we speak to God; but when we read, God speaks to us.” -St Jerome, "As the reading of bad books fills the mind with worldly and poisonous sentiments; so, on the other hand, the reading of pious works fills the soul with holy thoughts and good desires." -St. Alphonsus Liguori, "And above all, be on your guard not to want to get anything done by force, because God has given free will to everyone and wants to force no one, but only proposes, invites and counsels." –St. Angela Merici, “Yet such are the pity and compassion of this Lord of ours, so desirous is He that we should seek Him and enjoy His company, that in one way or another He never ceases calling us to Him . . . God here speaks to souls through words uttered by pious people, by sermons or good books, and in many other such ways.” —St. Teresa of Avila, "I want a laity, not arrogant, not rash in speech, not disputatious, but men and women who know their religion, who enter into it, who know just where they stand, who know what they hold and what they do not, and who know their creed so well that they can give an account of it, who know so much of history that they can defend it. I want an intelligent, well-instructed laity… I wish you to enlarge your knowledge, to cultivate your reason, to get an insight into the relation of truth to truth, to learn to view things as they are, to understand how faith and reason stand to each other, what are the bases and principles of Catholicism, and where lie the main inconsistences and absurdities of the Protestant theory.” (St. John Henry Newman, “Duties of Catholics Towards the Protestant View,” Lectures on the Present Position of Catholics in England), "We cannot always have access to a spiritual Father for counsel in our actions and in our doubts, but reading will abundantly supply his place by giving us directions to escape the illusions of the devil and of our own self-love, and at the same time to submit to the divine will.” —St. Alphonsus Ligouri, "The harm that comes to souls from the lack of reading holy books makes me shudder . . . What power spiritual reading has to lead to a change of course, and to make even worldly people enter into the way of perfection." –St. Padre Pio, "Screens may grab our attention, but books change our lives!" – Word on Fire, "Reading has made many saints!" -St Josemaría Escrivá, "Do you pray? You speak to the Bridegroom. Do you read? He speaks to you." —St. Jerome, from his Letter 22 to Eustochium, "Encounter, not confrontation; attraction, not promotion; dialogue, not debate." -cf Pope Francis, "God here speaks to souls through…good books“ – St Teresa of Avila, Interior Castle, "You will not see anyone who is really striving after his advancement who is not given to spiritual reading. And as to him who neglects it, the fact will soon be observed by his progress.” -St Athanasius, "To convert someone, go and take them by the hand and guide them." -St Thomas Aquinas, OP. 1 saint ruins ALL the cynicism in Hell & on Earth. “When we pray we talk to God; when we read God talks to us…All spiritual growth comes from reading and reflection.” -St Isidore of Seville, “Also in some meditations today I earnestly asked our Lord to watch over my compositions that they might do me no harm through the enmity or imprudence of any man or my own; that He would have them as His own and employ or not employ them as He should see fit. And this I believe is heard.” -GM Hopkins, SJ, "Only God knows the good that can come about by reading one good Catholic book." — St. John Bosco, "Why don't you try explaining it to them?" – cf St Peter Canisius, SJ, Doctor of the Church, Doctor of the Catechism, "Already I was coming to appreciate that often apologetics consists of offering theological eye glasses of varying prescriptions to an inquirer. Only one prescription will give him clear sight; all the others will give him at best indistinct sight. What you want him to see—some particular truth of the Faith—will remain fuzzy to him until you come across theological eye glasses that precisely compensate for his particular defect of vision." -Karl Keating, "The more perfectly we know God, the more perfectly we love Him." -St Thomas Aquinas, OP, ST, I-II,67,6 ad 3, “But always when I was without a book, my soul would at once become disturbed, and my thoughts wandered." —St. Teresa of Avila, "Let those who think I have said too little and those who think I have said too much, forgive me; and let those who think I have said just enough thank God with me." –St. Augustine, "Without good books and spiritual reading, it will be morally impossible to save our souls." —St. Alphonsus Liguori "Never read books you aren't sure about. . . even supposing that these bad books are very well written from a literary point of view. Let me ask you this: Would you drink something you knew was poisoned just because it was offered to you in a golden cup?" -St. John Bosco " To teach in order to lead others to faith is the task of every preacher and of each believer." —St. Thomas Aquinas, OP. "Prayer purifies us, reading instructs us. Both are good when both are possible. Otherwise, prayer is better than reading." –St. Isidore of Seville “The aid of spiritual books is for you a necessity.… You, who are in the midst of battle, must protect yourself with the buckler of holy thoughts drawn from good books.” -St. John Chrysostom